fix e2e test

Author: David Hasani

packages/core/src/codewhisperer/service/transformByQ/transformationResultsViewProvider.ts

@@ -365,7 +365,7 @@ export class ProposedTransformationExplorer {
         })
 
         vscode.commands.registerCommand('aws.amazonq.transformationHub.summary.reveal', async () => {
-            if (transformByQState.getSummaryFilePath() !== '') {
+            if (fs.existsSync(transformByQState.getSummaryFilePath())) {
                 await vscode.commands.executeCommand(
                     'markdown.showPreview',
                     vscode.Uri.file(transformByQState.getSummaryFilePath())